I'd be more than happy to discuss with you about how Grooveshark tackled specific issues. I'm especially interested in metadata/user uploads management: how did you process user uploaded files and match them to the corresponding metadata, was there some kind of metadata moderation on your side, that sort of stuff.
Feel free to drop me an email or contact me on matrix, all the contact info are here: https://funkwhale.audio/contribute/
Thank you so much for offering this kind of help!
"Oh, you're struggling with implementing a feature? Well, the guy who originally built the concept your feature is based off of is chilling in the back of the room. Maybe you should ask him."